Hi, I'm considering buying a new PC. At first I thought of buying it piece by piece, but then I came around a website from my area that had these two on offer (sorry about it being in spanish, but reading just the column to the right you should get it just fine):

525€
Descripción del producto
iLife BS70-15 INTEL CORE i5 3570 (3,40GHz)
Tipo Ordenador personal tipo Basic Plus
Caja Tacens OMNIA ATX
Fuente de alimentación 500W (FAN 12CM)
Placa Base Gigabyte B75M-D3H (B75)
Procesador 1 x INTEL CORE i5 3570 ( 4 núcleos )
Memoria caché 6 MB L2
Caché por núcleo 1.5 MB
Memoria RAM 8GB DDR3 1600MHz KINGSTON HyperX
Disco duro Western Digital 1TB SATA
Controlador de almacenamiento Serial ATA ( ATA-300, ATA-600 )
Controlador gráfico ASUS NVIDIA GeForce GT610 1GB DDR3
Almacenamiento óptico Grabadora DVD±RW DL
Conexión de redes LAN 10/100/1000
Audio salida Sonido envolvente de 8 canales
Lector de tarjetas Si
Monitor Ninguno
Peso 7-8 kg
Otros VGA, DVI, HDMI, USB 3.0, PS/2
735€ version:

Descripción del producto iLife GA11-15 INTEL CORE i7 3770 (3,40GHz)
Tipo Ordenador personal
Caja Cooler Master 430 ELITE ATX
Fuente de alimentación Cooler Master 600W (FAN 12CM)
Placa Base Gigabyte H77M-D3H (H77)
Procesador 1 x INTEL CORE i7 3770 (3,40GHz) 8MB
Memoria caché 8 MB L2
Caché por núcleo 2 MB
Memoria RAM 8GB (1x8) DDR3 1600MHz KINGSTON HyperX
Disco duro Western Digital Caviar 1TB SATA 6Gb/s
Controlador de almacenamiento Serial ATA-600, ATA-300 con soporte RAID 0,1,5,10
Controlador gráfico NVIDIA GTX650 1GB DDR5
Almacenamiento óptico Grabadora DVD±RW DL
Conexión de redes GBLAN 10/100/1000
Audio salida Sonido envolvente de 8 canales
Lector de tarjetas Si (85 en 1)
Monitor Ninguno
Peso 10 kg
Otros Audio 7.1, VGA, DVI, HDMI, PS/2 USB 3.0

So what is your opinion on those two? Is it worth it to get the more expensive one? What parts would you change if you had the option?

This PC will be used with Windows 7 to play games, amongst other things.

Please, bring me your opinions.